KR20190131575A - Liquid crystal display - Google Patents

Abstract

The present invention provides a liquid crystal display device in which a change in color tone when viewing in the oblique direction at the time of black display is suppressed even when there is a deviation of the bonding angle between the polarizer and the optical compensation layer. The liquid crystal display device of the present invention is a liquid crystal display device including at least a liquid crystal cell and a pair of polarizing plates arranged to sandwich the liquid crystal cell, wherein the tilt angle of the liquid crystal compound is 1.0 ° or less, and between the pair of polarizing plates. In addition, each color filter disposed on each pixel region of the liquid crystal cell is included on the viewer side than the liquid crystal cell, and Rth of each color filter satisfies a predetermined requirement, and is disposed on the viewer side of the pair of polarizing plates. The polarizing plate includes an optical compensation layer and a polarizer from the liquid crystal cell side, and the optical compensation layer satisfies predetermined requirements.

Description

Liquid crystal display

The present invention relates to a liquid crystal display device.

IPS (In-Plane Switching) and FFS (Fringe Field Switching) type liquid crystal display devices, such as twisted nematic (TN) type and vertical alignment (VA) type, apply an electric field between the upper and lower substrates to raise the liquid crystal compound. It is a mode (mode) called a transverse electric field system which responds a liquid crystalline compound to an in-plane direction of a board | substrate by the electric field containing the component which is substantially parallel to a board | substrate surface, not a mode driven by.

In addition, since the IPS type and the FFS type have a method of limiting the viewing angle in principle from the structure, they are known as driving methods having characteristics such as wide viewing angle and small chromaticity variation and color tone change.

As for these liquid crystal display devices of the transverse electric field system, in Patent Document 1, in order to reduce the color tone change in the inclination direction of the black display, a configuration in which a polarizing plate, a liquid crystal layer, a color filter, and an optical compensation member are combined Is disclosed.

Japanese Unexamined Patent Publication No. 2014-016642

When manufacturing a liquid crystal display device, the method of bonding various members is often taken. In that case, both are bonded together so that the absorption axis of a polarizer and the in-plane slow axis of an optical compensation layer may become predetermined angle relationship, for example.

MEANS TO SOLVE THE PROBLEM The present inventors examined the liquid crystal display device of patent document 1, When the angle | corner of the absorption axis of a polarizer and the in-plane slow axis of an optical compensation layer shifts a predetermined range even a little, in the inclination direction at the time of black display, We found that there was a problem that change in hue of 커 increased. If there exists a problem as mentioned above, when manufacturing a liquid crystal display device, if the bonding angle of a polarizer and an optical compensation layer shifts even a little, a desired effect will not be exhibited, and it is easy to cause a fall of a yield.

In view of the above circumstances, the present invention provides a liquid crystal display device in which a change in color tone at the time of viewing in the oblique direction at the time of black display is suppressed even when there is a shift in the bonding angle between the polarizer and the optical compensation layer. It is a task to do it.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining about the problem of the prior art, it discovered that the said subject could be solved if it was a liquid crystal display device of a predetermined structure.

That is, it discovered that the said objective can be achieved by the following structures.

(1) A substrate having at least one opposingly arranged pair of substrates having an electrode and a liquid crystal layer disposed between the pair of substrates and containing an alignment controlled liquid crystal compound, wherein the electrode has a substrate A liquid crystal cell in which an electric field having a parallel component is formed, and

It is a liquid crystal display device which contains at least a pair of polarizing plate arrange | positioned by sandwiching a liquid crystal cell,

The tilt angle of the liquid crystal compound is 1.0 ° or less,

The liquid crystal cell comprises at least a first pixel region, a second pixel region, and a third pixel region,

Between the pair of polarizing plates, a first color filter disposed on the first pixel region of the liquid crystal cell, a second color filter disposed on the second pixel region of the liquid crystal cell, and a third pixel region of the liquid crystal cell. The arranged third color filter is included in the visual recognition side than a liquid crystal cell,

First, when the wavelength of the wavelength of the wavelength at which the maximum transmittance of the color filters representing the maximum transmittance at λ _1, the second color filter that represents the maximum transmittance of λ _2, and a third color filter as λ _3, λ ₁ <λ Satisfy the relationship of ₂ <λ ₃ ,

Retardation Rth (λ ₁ ) in the thickness direction at wavelength λ ₁ of the first color filter, Retardation Rth (λ ₂ ) in the thickness direction at wavelength λ ₂ of the second color filter, and the third color filter the retardation Rth (λ ₃₎ in the thickness direction at a wavelength λ _3, and meets the requirements of formulas (1) - (3) below,

Of a pair of polarizing plates, the polarizing plate arrange | positioned at the visual recognition side contains an optical compensation layer and a polarizer from the liquid crystal cell side,

The in-plane slow axis of the optical compensation layer and the absorption axis of the polarizer are parallel,

In-plane retardation Re (450) at wavelength 450nm, in-plane retardation Re (550) at wavelength 550nm, and in-plane retardation Re (650) at wavelength 650nm of the optical compensation layer are described below. A liquid crystal display device which satisfies the requirements of 5) and (6).

(2) The liquid crystal display device as described in (1) which satisfy | fills the requirements of Formula (1-1) mentioned later.

(3) the optical compensation layer is one layer,

In-plane retardation Re1 (550) in wavelength 550nm of optical compensation layer, and retardation Rth1 (550) of thickness direction in wavelength 550nm satisfy | fills requirements of Formula (6) and (7) mentioned later. , (1) or liquid crystal display according to (2).

(4) the optical compensation layer includes a first optical compensation layer and a second optical compensation layer in order from the liquid crystal cell side,

In-plane retardation Re1 (550) in wavelength 550nm of the 1st optical compensation layer, and retardation Rth1 (550) of thickness direction in wavelength 550nm satisfy | fill the requirements of Formula (8) and (9) mentioned later. Satisfying,

In-plane retardation Re2 (550) at the wavelength of 550 nm and retardation Rth2 (550) in the thickness direction at the wavelength of 550 nm of the second optical compensation layer meet the requirements of formulas (10) and (11) described later. The liquid crystal display device as described in (1) or (2) to satisfy.

(5) The liquid crystal display device according to (4), wherein the first optical compensation layer is a positive A plate, and the second optical compensation layer is a positive C plate.

(6) The liquid crystal display device according to (5), wherein the first optical compensation layer is a λ / 4 layer.

(7) Retardation Rth2 (450) of thickness direction in wavelength 450nm of the 2nd optical compensation layer, and retardation Rth2 (550) of thickness direction in wavelength 550nm are requirements of Formula (12) mentioned later. The liquid crystal display device in any one of (4)-(6) which satisfy | fills.

(8) The liquid crystal display device according to any one of (4) to (7), wherein the second optical compensation layer is a film fixed in a state in which the liquid crystal compound is aligned.

(9) The liquid crystal display device according to (8), wherein the second optical compensation layer is a film obtained by fixing the rod-like liquid crystal compound in a state in which the rod-like liquid crystal compound is oriented in the vertical direction with respect to the substrate surface.

(10) The liquid crystal display device according to any one of (4) to (9), wherein the first optical compensation layer is a cycloolefin polymer film.

(11) The liquid crystal display device according to any one of (1) to (10), wherein the refractive index is substantially isotropic between the polarizer on the non-visible side of the liquid crystal cell and the liquid crystal layer.

(12) The liquid crystal display device according to any one of (1) to (11), wherein the optical compensation layer is attached to the polarizer via a polyvinyl alcohol adhesive.

(13) The liquid crystal display device according to any one of (1) to (11), wherein the optical compensation layer is adhered to the polarizer via the curable adhesive composition cured by irradiation or heating of an active energy ray.

The liquid crystal display device in any one of (1)-(13) which satisfy | fills the requirements of Formula (1-2) mentioned later.

According to this invention, even if there exists a shift | offset | difference of the bonding angle of a polarizer and an optical compensation layer, the liquid crystal display device in which the hue change at the time of visual recognition in the inclination direction at the time of black display is suppressed can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows an example of embodiment of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

Although description of the element | module described below may be made | formed based on typical embodiment of this invention, this invention is not limited to such embodiment.

In this specification, the numerical range represented using "-" means the range which includes the numerical value described before and after "-" as a lower limit and an upper limit.

In addition, in this specification, a polarizing plate means what the protective layer or the functional layer is arrange | positioned on at least one surface of a polarizer, and uses a polarizer and a polarizing plate separately.

In addition, in this specification, parallel and orthogonal do not mean parallel and orthogonal in a strict meaning, but mean the range of +/- 5 degrees from parallel or orthogonal, respectively.

In addition, in this specification, "(meth) acrylate" is the notation which means any one of an acrylate and a methacrylate, and "(meth) acryl" is the notation which means any one of an acryl and methacryl. "(Meth) acryloyl" is a notation which means either acryloyl or methacryloyl.

In this specification, Re ((lambda)) and Rth ((lambda)) represent the in-plane retardation in the wavelength (lambda), and the retardation of the thickness direction, respectively. When there is no special description, wavelength (lambda) is set to 550 nm.

In the present invention, Re (λ) and Rth (λ) are values measured at wavelength λ in AxoScan OPMF-1 (manufactured by Optoscience). By inputting the average refractive index ((nx + ny + nz) / 3) and the film thickness (d (μm)) with AxoScan,

In-plane slow axis direction (°)

Re (λ) = R0 (λ)

Rth (λ) = ((nx + ny) / 2-nz) × d is calculated.

In the present invention, Nz is represented by Nz factor = Rth (550) / Re (550) + 0.5 by in-plane retardation Re (550) of wavelength 550nm of retardation layer and retardation Rth (550) of thickness direction. Is defined.

In the present invention, the refractive indices nx, ny and nz are measured using an Abbe refractometer (NAR-4T, manufactured by Atago Co., Ltd.) using a sodium lamp (λ = 589 nm) as a light source.

In addition, when measuring wavelength dependence, it can measure by a combination with an interference filter by the multiwavelength Abbe refractometer DR-M2 (made by Atago Co., Ltd.).

Moreover, the value of the catalog of a polymer handbook (JOHN WILEY & SONS, INC) and various optical films can also be used.

The value of the average refractive index of the main optical film is illustrated below: cellulose acylate (1.48), cycloolefin polymer (1.52), polycarbonate (1.59), polymethyl methacrylate (1.49), polystyrene (1.59).

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

The liquid crystal display device shown in FIG. 1 has the liquid crystal cells 7-9, the upper polarizing plates 16 (1-6), the lower polarizing plates 17 (10-13), and the lower polarizing plate which sandwiched the liquid crystal cell ( Further to the outside of 17, a backlight unit 14 is included. The liquid crystal cells 7 to 9 include a liquid crystal cell upper substrate 7, a liquid crystal cell lower substrate 9, and a liquid crystal layer 8 sandwiched therebetween. The lower substrate 9 has an electrode layer (not shown in FIG. 1) on its opposite surface, and the electrode layer is configured to be able to donate an electric field parallel to the surface of the substrate 9 to the liquid crystal layer. The electrode layer is usually made of transparent indium tin oxide (ITO). On the electrode layer of the board | substrate 9 and the opposing surface of the board | substrate 7, the orientation layer (not shown in FIG. 1) which controls the orientation of the liquid crystalline compound 8 is formed, and the orientation of the liquid crystalline compound 8 is formed. The direction is controlled. In order to maintain the symmetry of the display, the alignment layer is preferably a UV (ultra violet) alignment layer.

In FIG. 1, the liquid crystal cell is disposed between the upper polarizing plate 16 and the lower polarizing plate 17. The upper polarizing plate 16 includes a protective film 1, a polarizer 2, and an optical compensation layer 15 (4 to 5). The lower polarizing plate 17 includes a polarizer 11 and protective films 10 and 13 disposed on both surfaces thereof.

The upper polarizing plate 16 and the lower polarizing plate 17 are arranged such that the absorption axis 3 of the polarizer 2 in the upper polarizing plate 16 and the absorption axis 12 of the polarizer 11 in the lower polarizing plate 17 are perpendicular to each other. do. When the upper polarizing plate 16 is used as the polarizing plate of the visual recognition side, the absorption axis 3 of the polarizer 2 in the upper polarizing plate 16 is a liquid crystalline compound in the liquid crystal cell in a voltage-free state (OFF state) ( It is preferable to laminate so as to be orthogonal to the abnormal light refractive index direction of 8).

Although not shown in FIG. 1, a blue color filter (hereinafter also referred to as "BCF") on the liquid crystal cell upper substrate 7 (on the surface of the viewing side (upper polarizer side) of the liquid crystal cell upper substrate 7). , A green color filter (hereinafter also referred to as "GCF"), and a red color filter (hereinafter also referred to as "RCF") are disposed.

In addition, the liquid crystal cell includes three pixel regions in which the above-described BCF, GCF, and RCF are disposed.

The said BCF, GCF, and RCF correspond to the 1st color filter, the 2nd color filter, and the 3rd color filter of the liquid crystal display device of this invention, respectively. The three pixel regions in the liquid crystal cell correspond to the first pixel region, the second pixel region, and the third pixel region included in the liquid crystal cell in the liquid crystal display device of the present invention, respectively.

In FIG. 1, the case where light injects from the backlight unit 14 arrange | positioned on the outer side of the lower polarizing plate 22 is considered. In the non-driven state (OFF state) in which the driving voltage is not applied to the electrode (not shown in FIG. 1), the liquid crystal compound 8 in the liquid crystal layer is the liquid crystal cell upper substrate 7 and the liquid crystal cell lower substrate 9. ) And its major axis is substantially parallel to the absorption axis 12 of the polarizer 11. In this state, the light which became a predetermined polarization state by the polarizer 11 does not receive the birefringence effect of the liquid crystalline compound 8, and is absorbed by the absorption axis 3 of the polarizer 2 as a result. At this time, black display is obtained. In contrast, in a driving state (ON state) in which a driving voltage is applied to an electrode (not shown in FIG. 1), an electric field including a component parallel to the substrate is formed, and the liquid crystal compound 8 has its long axis. The orientation is made in accordance with the direction of the electric field. As a result, the polarization state changes by the birefringence effect of the liquid crystal compound 8, and the light which became the predetermined polarization state by the polarizer 11 passes as a result the polarizer 2. At this time, a white display is obtained.

In the liquid crystal display device of the present invention, the polarizer and the optical compensation layer are controlled by controlling the retardation Rth in the thickness direction of BCF, GCF, and RCF for each pixel region, and setting the phase difference and wavelength dispersion of the optical compensation layer to a predetermined range. Even when there exists a shift | offset | difference of the bonding angle with, the hue change at the time of visual recognition in the diagonal direction at the time of black display is suppressed.

In addition, in the liquid crystal display device of the present invention, even when there is almost no deviation of the bonding angle between the polarizer and the optical compensation layer, the change in color tone when viewed in the oblique direction at the time of black display is suppressed, and at the time of black display. Light leakage of the inclined visual field generated is also suppressed.

Hereinafter, each member included in the liquid crystal display device will be described in detail.

<Liquid crystal cell>

The liquid crystal cell in the liquid crystal display device shown in FIG. 1 has a pair of opposingly arranged board | substrates which have an electrode at least one, and the liquid crystal layer which consists of the liquid crystal compound arrange | positioned between board | substrates, and was controlled.

It is preferable to arrange | position the orientation layer which orientates a liquid crystalline compound to both of the opposing surfaces inside of a board | substrate (corresponding to a liquid crystal cell upper substrate and a liquid crystal cell lower substrate). Moreover, it is common to arrange | position a columnar or spherical spacer for maintaining the distance (cell gap) between two board | substrates in a liquid crystal layer.

In addition, you may arrange | position a reflecting plate, a condenser lens, a brightness improving film, a light emitting layer, a fluorescent layer, a phosphorescent layer, an antireflection film, an antifouling film, a hard-coat film, etc. in a liquid crystal cell.

As a board | substrate, a transparent glass substrate is preferable. Moreover, as a board | substrate for liquid crystal cells, you may use the silicon glass board | substrate more durable, and the high temperature resistant plastic board.

The kind of liquid crystalline compound which comprises a liquid crystal layer is not specifically limited. For example, you may use a nematic liquid crystalline compound (for example, the nematic liquid crystalline compound whose dielectric anisotropy (DELTA) epsilon is positive) as a liquid crystalline compound. The larger the dielectric anisotropy Δε of the nematic liquid crystal compound, the lower the driving voltage can be, and the smaller the refractive anisotropy Δn can make the thickness (gap) of the liquid crystal layer thicker. Encapsulation time can be shortened and gap deviation can be reduced.

As for the thickness (gap) of a liquid crystal layer, more than 2.8 micrometers and less than 4.5 micrometers are preferable.

When retardation ((DELTA) n * d) of a liquid crystal layer is made into more than 0.25 micrometer and less than 0.40 micrometer, the transmittance | permeability characteristic which has little wavelength dependence in the range of visible light is obtained more easily.

Moreover, the maximum transmittance | permeability is obtained when a liquid crystalline compound rotates 45 degrees from the original orientation direction to the horizontal direction.

In addition, the thickness (gap) of a liquid crystal layer can be normally controlled by polymer beads. In addition to the polymer beads, glass beads, fibers, and resinous columnar spacers may be used.

In general, in the IPS system, unlike the conventional electric field system represented by the conventional TN system, the interface tilt with the substrate surface is not required in principle, and it is known that the smaller the interface tilt angle, the better the viewing angle characteristic. .

In the liquid crystal layer in the liquid crystal display device of the present invention, the tilt angle of the liquid crystal compound is 1.0 ° or less. Although a lower limit in particular is not restrict | limited, 0 degree is mentioned. In addition, the said tilt angle intends the angle which the long axis of a liquid crystalline compound and the surface of a board | substrate make.

In order to realize the said tilt angle, the aspect using an orientation layer is mentioned as mentioned above. In the conventional mass production technique, a rubbing treatment is performed on an alignment control layer made of a polymer film such as polyimide, to impart liquid crystal alignment ability (initial alignment) to form an alignment layer. On the other hand, the cloth for rubbing is comprised of 10-30 micrometers-thick fine fibers, and it is substantially liquid crystal aligning ability by the one strand of this thin fiber giving a predetermined shear force to the local part of an orientation layer. The process of giving is made. Since the electrode spacing in IPS system is about 10-30 micrometers about the same as the diameter of the said fiber, rubbing of a level | step difference is not enough, and orientation tends to be disturbed. The disturbance of this orientation causes a decrease in contrast ratio and a decrease in image quality such as unevenness in luminance and color tone. As a method of solving the problem of these rubbing orientation processes, the photo-alignment method which irradiates the surface of a polymer film with polarized ultraviolet-ray etc., and orientates a liquid crystalline compound without performing a rubbing process is proposed. For example, Japanese Unexamined Patent Application Publication No. 2005-351924 discloses that the tilt angle of a liquid crystalline compound is 1.0 ° or less using the photoalignment method, and it is preferable to use the photoalignment method also in the present invention. .

As described above, the liquid crystal cell includes a pixel region in which BCF, GCF, and RCF are disposed on the surface thereof and correspond to the respective color filters. In other words, the liquid crystal cell includes a plurality of pixel regions, and BCF, GCF, and RCF are disposed on the liquid crystal cell so as to correspond to each pixel region.

In addition, in the liquid crystal display device which normally performs color display, the subpixel (pixel area | region) of three primary colors (red, green, and blue) of light becomes one set, and forms one pixel. In addition, one pixel may be formed of three or more subpixels.

<Color filter>

The liquid crystal display device shown in FIG. 1 includes the color filter arrange | positioned on each pixel area | region of a liquid crystal cell between a pair of polarizing plate. More specifically, BCF, GCF, and RCF are arrange | positioned on the liquid crystal cell upper substrate in a liquid crystal cell. In addition, BCF, GCF, and RCF are all arrange | positioned at the visual recognition side (upper polarizing plate side).

In addition, BCF is a color filter showing the maximum transmittance in the blue region (wavelength 420-490nm), GCF is a color filter showing the maximum transmittance in the green region (wavelength 495-570nm), and RCF is a blue region (wavelength 580-700nm) Is a color filter showing the maximum transmittance.

In addition, in this specification, "maximum transmittance" means the largest transmittance in visible region (400-700 nm).

Speaking of the wavelength at which the maximum transmittance of BCF λ ₁ (nm), ₂ the wavelength at which the maximum transmittance of GCF λ (nm), ₃ the wavelength at which the maximum transmittance of the _{RCF λ (nm), λ 1} <λ 2 < The relationship of λ ₃ is satisfied.

Further, in the thickness direction at a wavelength λ ₁ of BCF retardation Rth (λ _1), in the thickness direction at a wavelength λ ₂ of the GCF retardation Rth (λ _2), and the thickness of the RCF wavelength λ ₃ of the The retardation Rth (λ ₃ ) in the direction satisfies the requirements of the formulas (1) to (3).

(1) (Rth (λ ₁ ) -5nm) ≤Rth (λ ₂ ) ≤Rth (λ ₃ )

Equation (2) -5nm≤Rth (λ ₂ ) ≤25nm

Equation (3) -10nm≤Rth (λ ₁ ) ≤25nm

Especially, it is preferable to satisfy | fill the requirements of Formula (1-1), and it is more preferable to satisfy the requirements of Formula (1-2).

Equation _{(1-1) Rth (λ 1)} ≤Rth (λ 2) ≤Rth (λ 3)

Equation (1-2) Rth (λ ₁ ) <Rth (λ ₂ ) <Rth (λ ₃ )

Moreover, it is preferable to satisfy the requirement of Formula (2-1), and it is preferable to satisfy the requirement of Formula (2-2).

Equation (2-1) -5nm≤Rth (λ ₂ ) ≤20nm

Equation (2-2) 0nm≤Rth (λ ₂ ) ≤15nm

Moreover, it is preferable to satisfy the requirement of Formula (3-1), and it is preferable to satisfy the requirement of Formula (3-2).

Equation (3-1) -10nm≤Rth (λ ₁ ) ≤15nm

Equation (3-2) -5nm≤Rth (λ ₁ ) ≤10nm

Although Rth ((lambda) ₃ ) does not restrict | limit especially if it satisfy | fills the requirements of said Formula (1), It is preferable that it is 0-35 nm, and it is more preferable that it is 10-25 nm.

Although the method of achieving the said requirement is not restrict | limited, For example, the method of adjusting the thickness of a color filter and adjusting Rth of each color filter as a method of satisfying the requirement of Formula (1) is mentioned.

Moreover, you may adjust Rth of a color filter by adding a retardation increasing agent or a reducing agent in a color filter.

As a retardation synergist, the compound represented by general formula (X) and a compound similar to this are mentioned.

[Formula 1]

As a retardation reducing agent, the compound represented by general formula (XI) is mentioned.

[Formula 2]

In said general formula (XI), R <^11> represents an alkyl group or an aryl group, and R <^12> and R <^13> respectively independently represent a hydrogen atom, an alkyl group, or an aryl group. Moreover, as for the total of carbon number of R <^11> , R <^12> and R <^13> , 10 or more are preferable. R ¹¹ , R ¹² and R ¹³ may have a substituent, and as the substituent, a fluorine atom, an alkyl group, an aryl group, an alkoxy group, a sulfone group or a sulfonamide group is preferable, and an alkyl group, an aryl group, an alkoxy group, a sulfone group or a sulfonamide Group is more preferable.

In addition, the alkyl group may be linear, branched, or cyclic. 1-25 are preferable, as for carbon number of an alkyl group, 6-25 are more preferable, and 6-20 are more preferable. As the alkyl group, for example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, t-butyl group, amyl group, isoamyl group, t-amyl group, hexyl group, cyclohexyl group, heptyl group , Octyl, bicyclooctyl, nonyl, adamantyl, decyl, t-octyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, An octadecyl group, a nonadecyl group, and a didecyl group are mentioned.

6-30 are preferable and, as for carbon number of an aryl group, 6-24 are more preferable. As an aryl group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a binaphthyl group, or a triphenylphenyl group is preferable.

The manufacturing method of a color filter (BCF, GCF, RCF) is not specifically limited, For example, after apply | coating a coloring photosensitive resin composition with a spin coater etc., the coloring resist method and the lamination method etc. which are patterned by a photolithography process are mentioned. Can be. As a formation method including a coating process such as a colored resist method, color filters having different thicknesses can be formed by adjusting the coating amount. In addition, in the lamination method, color filters having different thicknesses can be formed by using transfer materials having different thicknesses.

In addition, you may arrange | position a black matrix between each color filter as needed. The method for producing the black matrix is not particularly limited, and known methods may be mentioned.

In addition, although BCF, GCF, and RCF contained in the liquid crystal display device shown in FIG. 1 were mainly demonstrated in detail above, this aspect is not restrict | limited, A color filter of a different color may be sufficient as BCF, GCF, and RCF. That is, in the liquid crystal display device of the present invention, the first color filter, the second color filter, and the third color filter disposed on each pixel region (first pixel region to third pixel region) of the liquid crystal cell are at least. is included, the retardation Rth (λ ₁₎ in the thickness direction at a wavelength λ ₁ of the first color filter, the second retardation Rth (λ ₂₎ in the thickness direction at a wavelength λ ₂ of the color filter, and the Even if the retardation Rth (λ ₃ ) in the thickness direction in the wavelength λ ₃ of the three color filters satisfies the requirements of the formulas (1) to (3), a color filter of a color other than BCF, GCF, and RCF may be used. do.

(1) (Rth (λ ₁ ) -5nm) ≤Rth (λ ₂ ) ≤Rth (λ ₃ )

Equation (2) -5nm≤Rth (λ ₂ ) ≤25nm

Equation (3) -10nm≤Rth (λ ₁ ) ≤25nm

<Polarizing plate>

The liquid crystal display device shown in FIG. 1 contains a pair of polarizing plate.

Of a pair of polarizing plates, the polarizing plate (upper polarizing plate) arrange | positioned at the visual recognition side contains an optical compensation layer and a polarizer from the liquid crystal cell side. Further, the absorption axis of the polarizer and the in-plane slow axis of the optical compensation layer are arranged to be parallel to each other.

Moreover, as above-mentioned, the upper polarizing plate in FIG. 1 contains a protective film in the optical compensation layer of a polarizer, and the surface of the reverse side. Moreover, you may arrange | position a cured resin layer instead of a protective film.

Of a pair of polarizing plates, the polarizing plate (lower polarizing plate) arrange | positioned on the opposite side to the viewer side contains a polarizer and the protective film arrange | positioned at both surfaces.

In addition, the said protective film is arbitrary members and does not need to be contained in the liquid crystal display device.

Hereinafter, each member is demonstrated in detail.

(Optical compensation layer)

An optical compensation layer is comprised from one layer or two or more layers, and has substantially flat Re wavelength dispersion as shown by Formula (4) and Formula (5) mentioned later. The optical compensation layer has a function of reducing light leakage when viewed from an inclination by eliminating the viewing angle dependency on the G light (550 nm) of the pair of polarizers arranged at right angles to each other. As long as the optical compensation layer has a function of reducing light leakage, the optical compensation layer can have any configuration of phase difference.

In-plane retardation Re (450) in wavelength 450nm of the optical compensation layer, in-plane retardation Re (550) in wavelength 550nm, and in-plane retardation Re (650) in wavelength 650nm are Formula (5) And (6).

Equation (4) 0.95≤Re (450) / Re (550) ≤1.10

Equation (5) 0.95≤Re (550) / Re (650) ≤1.10

As above-mentioned, the optical compensation layer may be comprised by one layer and may be comprised by two or more layers. In this invention, it is preferable that it consists of one or two optical compensation layers.

In the case of the one-layer configuration, only the first optical compensation layer, and in the case of the two-layer configuration, consist of the first optical compensation layer and the second optical compensation layer. In any of the layer configurations, the optical compensation layer as a whole satisfies the above formulas (4) and (5), and the in-plane slow axis of the optical compensation layer is the absorption axis of the polarizer disposed on the same side with respect to the liquid crystal cell (viewing side polarizing plate). In the absorption axis of the polarizer).

As an optical compensation layer, the polymer film or the film formed using a liquid crystalline composition is preferable from a viewpoint of manufacture ease.

As the polymer film, a cellulose acylate film, a cycloolefin polymer film (polymer film using a cycloolefin polymer), or an acrylic polymer film is preferable. As an acryl-type polymer film, it is preferable to contain the acryl-type polymer containing at least 1 sort (s) of unit chosen from a lactone ring unit, a maleic anhydride unit, and a glutaric anhydride unit.

From the point of thinning of a liquid crystal display device, the thickness of a polymer film is thin as long as it does not impair optical characteristic, mechanical property, and manufacturing aptitude, Specifically, 1-150 micrometers is preferable and 1-70 micrometers is more preferable. 1-30 micrometers is more preferable.

The film formed using a liquid crystalline composition is a film formed using a composition containing a liquid crystalline compound, and a film fixed in a state in which the liquid crystalline compound is aligned is preferable. Especially, the film formed by apply | coating the composition containing the liquid crystalline compound which has a polymeric group, forming a coating film, orienting the liquid crystalline compound in a coating film, performing a hardening process, and fixing the orientation of a liquid crystalline compound is more preferable. .

A rod-like liquid crystalline compound and a disk-like liquid crystalline compound are mentioned as a liquid crystalline compound, It is preferable to have a polymeric group in order to fix an orientation state.

Hereinafter, the specific aspect of an optical compensation layer is demonstrated in detail.

(When the optical compensation layer consists of one layer)

When the optical compensation layer consists of one layer, it is formed of only the first optical compensation layer, and in the first optical compensation layer, the in-plane retardation Re1 (550) at a wavelength of 550 nm and the ritata in the thickness direction at a wavelength of 550 nm. It is preferable that the date Rth1 550 satisfies the requirements of the formulas (6) and (7).

Equation (6) 200nm≤Re1 (550) ≤320nm

Equation (7) -40nm≤Rth1 (550) ≤40nm

The 1st optical compensation layer is obtained by extending | stretching the film of the polymer which has the characteristic which becomes nz> nx, for example largely.

As a manufacturing method, for the film using cellulose acetate benzoate which is cellulose acylate substituted by aromatic acyl group, for example, the dope which melt | dissolved cellulose acetate benzoate in the solvent was cast | flow_spreaded on the metal support body for film-forming, and a solvent was dried, The method of obtaining a film, extending | stretching the obtained film by the large draw ratio of about 1.3-1.9 times, and orientating a cellulose molecular chain is mentioned.

Moreover, as described, for example, in Unexamined-Japanese-Patent No. 5-157911, and Unexamined-Japanese-Patent No. 2006-072309, it is also possible to produce by bonding a shrinkable film to one side or both sides of a polymer film, and heating and stretching. .

1-150 micrometers is preferable, as for the thickness of a 1st optical compensation layer, 1-70 micrometers is more preferable, and 1-30 micrometers is more preferable.

(Configuration in which the optical compensation layer consists of two layers)

When the optical compensation layer is composed of two layers, the first optical compensation layer is a biaxial film (B-plate or positive A plate) of nx> ny≥nz, and the second optical compensation layer is of nx ≒ ny <nz. It is preferable to consist of two layers of a uniaxial film (definition [quasi] C plate). Specifically, in-plane retardation Re1 (550) in wavelength 550nm of the 1st optical compensation layer, and retardation Rth1 (550) of thickness direction in wavelength 550nm are represented by Formula (8) and (9). Meet the requirements,

Equation (8) 80nm≤Re1 (550) ≤200nm

(9) 20nm≤Rth1 (550) ≤150nm

In-plane retardation Re2 (550) in wavelength 550nm of the 2nd optical compensation layer, and retardation Rth2 (550) of thickness direction in wavelength 550nm satisfy | fill the requirements of Formula (10) and (11). It is preferable.

Equation (10) 0nm≤Re2 (550) ≤40nm

Equation (11) -160 nm ≤ Rth 2 (550) ≤-40 nm

In this aspect, a 1st optical compensation layer is arrange | positioned at the liquid crystal cell side, and a 2nd optical compensation layer is arrange | positioned at the polarizer side.

As for a 1st optical compensation layer, it is more preferable to satisfy the following.

100nm≤Re1 (550) ≤150nm

50nm≤Rth1 (550) ≤120nm

The first optical compensation layer is a polymer film (for example, a cellulose acylate film, a cyclic polyolefin film, and a polycarbonate film) produced by a suitable method such as a melt film formation method and a solution film formation method, for example, the circumference of the roll It is obtained by extending | stretching by the longitudinal stretch system by speed control, the lateral stretch system by a tenter, biaxial stretching system, etc. More specifically, description of Unexamined-Japanese-Patent No. 2005-338767 can be referred. Moreover, the polymer formed from the liquid crystalline composition containing the liquid crystalline compound which has a polymeric group which shows biaxiality by orientation can also be used.

When an optical compensation layer consists of two layers, 1-80 micrometers is preferable, as for the thickness of a 1st optical compensation layer, 1-40 micrometers is more preferable, 1-25 micrometers is especially preferable.

When an optical compensation layer consists of two layers, it is preferable that a 1st optical compensation layer is a positive A plate.

As a manufacturing method of a positive A plate, description of Unexamined-Japanese-Patent No. 2008-225281 and Unexamined-Japanese-Patent No. 2008-026730 can be referred, for example.

In addition, in this specification, positive A plate is defined as follows. The positive A plate (definition A plate) has a refractive index in the in-plane slow axis direction (the direction in which the refractive index becomes the largest in the plane) of the film, nx, the refractive index in the direction orthogonal to the in-plane slow axis in-plane, and the refractive index in the thickness direction. When nz is satisfied, the relationship of the formula (A1) is satisfied. In addition, in positive A plate, Rth represents a positive value.

Formula (A1) nx> ny ≒ nz

In addition, the above-mentioned "≒" includes not only the case where both are completely the same, but also the case where both are substantially the same. The term "substantially equal" means "ny_nz" even when (ny-nz) x d (where d is the thickness of the film) is -10 to 10 nm, preferably -5 to 5 nm. Included.

In addition, in the above definition, the positive A plate satisfies Nz = Rth (550) / Re (550) + 0.5 × 1.0.

It is preferable that the said positive A plate is (lambda) / 4 layer.

The λ / 4 layer refers to a plate (retardation film) in which the in-plane retardation Re (λ) at a specific wavelength λnm satisfies Re (λ) ≒ λ / 4.

Although this expression should just be achieved in any wavelength (for example, 550 nm) of visible range, in-plane retardation Re (550) in wavelength 550nm satisfy | fills the relationship of 110 nm <Re (550) <= 160 nm. It is preferable to make 110 nm, and it is more preferable to satisfy Re (550) <150 nm.

As for a 2nd optical compensation layer, it is more preferable to satisfy the following.

0nm≤Re2 (550) ≤20nm

-140nm≤Rth2 (550) ≤-80nm

It is preferable that the retardation Rth2 (450) of the thickness direction in wavelength 450nm of the 2nd optical compensation layer, and the retardation Rth2 (550) of the thickness direction in wavelength 550nm satisfy | fill the requirements of Formula (12). Do.

Equation (12) Rth2 (450) / Rth2 (550) ≤1.00

More preferably, Rth2 (450) / Rth2 (550) is less than 0.95, still more preferably 0.90 or less. The lower limit is not particularly limited, but is often 0.75 or more.

A 2nd optical compensation layer is formed into a film so that in-plane retardation of a polymer film (for example, a cellulose acylate film, a cyclic polyolefin film, and a polycarbonate film) may not be expressed, and a thickness (nz) direction is used using a heat shrink film etc. It can be obtained by stretching.

Moreover, it is also possible to form the layer which has a desired phase difference by fixing the orientation state of a liquid crystalline compound. That is, it is preferable that it is a film which the 2nd optical compensation layer immobilized in the state which oriented the liquid crystalline compound, and it is more preferable that it is a film which was immobilized in the state where the rod-shaped liquid crystalline compound was orientated in the perpendicular direction with respect to the substrate surface.

As a liquid crystalline compound, it is also preferable to use the liquid crystalline compound which shows wavelength dispersion of reverse dispersion. For example, the liquid crystalline compound which shows the wavelength dispersion of the reverse dispersion described in WO2017 / 043438 pamphlet is mentioned.

1-80 micrometers is preferable, as for the thickness of a 2nd optical compensation layer, 1-40 micrometers is more preferable, and 1-25 micrometers is more preferable.

It is preferable that a 2nd optical compensation layer is a positive C plate.

As a manufacturing method of positive C plate, description of Unexamined-Japanese-Patent No. 2017-187732, Unexamined-Japanese-Patent No. 2016-053709, and Unexamined-Japanese-Patent No. 2015-200861 can be referred, for example.

In addition, in this specification, positive C plate is defined as follows. The positive C plate (definition C plate) has a refractive index in the in-plane slow axis direction (the direction in which the refractive index becomes the largest in the plane) of the film, nx, the refractive index in the direction perpendicular to the in-plane slow axis and in-plane, ny, and the refractive index in the thickness direction. When nz is satisfied, the relationship of the formula (A2) is satisfied. In addition, the positive C plate has a negative value of Rth.

Formula (A2) nx ≒ ny <nz

In addition, the above-mentioned "≒" includes not only the case where both are completely the same, but also the case where both are substantially the same. "Substantially equal" means "nx_ny" even when (nx-ny) xd (where d is the thickness of the film) is -10 to 10 nm, preferably -5 to 5 nm. Included.

Moreover, in positive C plate, it is Re'0 in the said definition.

It is also preferable that an optical compensation layer is a 2-layered constitution which consists of a cycloolefin polymer film and the film formed using the composition containing the liquid crystalline compound provided adjacent to a polymer film.

(Polarizer)

The kind of polarizer is not specifically limited, What is necessary is just a so-called linear polarizer which has a function which converts natural light into specific linearly polarized light.

As a polarizer, an absorption type polarizer is mentioned, for example, More specifically, an iodine type polarizer, the dye type polarizer using a dichroic dye, and a polyene type polarizer are mentioned.

3-60 micrometers is preferable, as for the thickness of a polarizer, 5-30 micrometers is more preferable, and its 5-15 micrometers are more preferable.

(Protective film)

A protective film is not specifically limited, For example, a cellulose acylate film (for example, a cellulose acetate film, a cellulose diacetate film, a cellulose acetate butyrate film, a cellulose acetate propionate film), a polymethyl methacrylate, etc. Polyacrylic resin film, polyolefin film such as polyethylene and polypropylene, polyester resin film such as polyethylene terephthalate and polyethylene naphthalate, polyether sulfone film, polyurethane resin film, polyester film, polycarbonate film , Polysulfone film, polyether film, polymethylpentene film, polyether ketone film, (meth) acrylonitrile film, cycloolefin polymer film (norbornene-based resin (Aton: brand name, JSR Corporation make), amorphous polyolefin (Xeonex: brand name, product made by Nippon Xeon company) is mentioned C. Among them, the preferable cellulose acylate film.

It is preferable that the optical characteristic of a protective film satisfy | fills following formula.

0nm≤Re3 (550) ≤10nm

-40nm≤Rth3 (550) ≤40nm

Moreover, like the protective film 10 of FIG. 1, when arrange | positioning a protective film between a polarizer and a liquid crystal cell, it is preferable to use the protective film which is substantially isotropic of refractive index, and what satisfy | fills following formula specifically, More preferred.

0nm≤Re3 (550) ≤5nm

-10nm≤Rth3 (550) ≤10nm

An adhesive agent can be used for lamination | stacking of a polarizer and an optical compensation layer, and lamination | stacking of a polarizer and a protective film. 0.01-30 micrometers is preferable, as for the thickness of an adhesive bond layer, 0.01-10 micrometers is more preferable, 0.05-5 micrometers is more preferable.

Examples of the adhesive include an aqueous adhesive, that is, an adhesive in which the adhesive component is dissolved or dispersed in water, and a polyvinyl alcohol adhesive is preferable. As a polyvinyl alcohol-type adhesive agent, the adhesive agent which consists of polyvinyl alcohol-type resin aqueous solution is preferable.

As a polyvinyl alcohol-type resin in a polyvinyl alcohol-type adhesive agent, in addition to the vinyl alcohol homopolymer obtained by saponifying polyvinyl acetate which is a homopolymer of vinyl acetate, it is obtained by saponifying the copolymer of vinyl acetate and the other monomer copolymerizable with this. Vinyl alcohol copolymers, and modified polyvinyl alcohol polymers obtained by partially modifying hydroxyl groups thereof.

Polyvinyl aldehyde, water-soluble epoxy compound, melamine type compound, zirconia compound, zinc compound, glyoxylate, etc. may be added to a polyvinyl alcohol adhesive as a crosslinking agent.

When using a polyvinyl alcohol-type adhesive agent, the thickness of the adhesive bond layer obtained therefrom is 1 micrometer or less normally.

As an adhesive agent, the curable adhesive composition hardened | cured by irradiation of an active energy ray or heating is mentioned. More specifically, the curable adhesive composition containing a cationically polymerizable compound, the curable adhesive composition containing a radically polymerizable compound, etc. which are hardened by irradiation of an active energy ray or heating are mentioned. As a cationically polymerizable compound, the compound which has an epoxy group or an oxetanyl group is mentioned. The epoxy compound is not particularly limited as long as it has at least two epoxy groups in the molecule, and examples thereof include compounds described in detail in JP-A-2004-245925.

The radically polymerizable compound is not particularly limited as long as it is a radically polymerizable compound having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group, and is a monofunctional radically polymerizable compound or a polyfunctional having two or more polymerizable groups in a molecule. A radically polymerizable compound, the (meth) acrylate which has a hydroxyl group, acrylamide, and acryloyl morpholine, etc. are mentioned, These compounds may be used independently, and may be used in combination. For example, the compound described in detail in Unexamined-Japanese-Patent No. 2015-011094 can be used. Moreover, you may use combining a radically polymerizable compound and a cationically polymerizable compound.

When using a curable adhesive composition, after bonding a film using a bonding roll, it drys as needed, and hardens a curable adhesive composition by irradiating or heating an active energy ray. The light source of the active energy ray is not particularly limited, but an active energy ray having a luminescence distribution at a wavelength of 400 nm or less is preferable, and specifically, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultra high pressure mercury lamp, a chemical lamp, a black light lamp, a microwave excitation Mercury lamps or metal halide lamps are more preferred.

Moreover, in bonding a polarizer, an optical compensation layer, or a protective film with an adhesive agent, surface treatment is performed on the surface which opposes a polarizer of an optical compensation layer or a protective film in order to improve adhesive strength and the wettability of an adhesive agent (for example, For example, glow discharge treatment, corona discharge treatment, UV treatment) may be performed, and an easily bonding layer may be formed.

As an easily bonding layer and its manufacturing method, description of Unexamined-Japanese-Patent No. 2007-127893 and Unexamined-Japanese-Patent No. 2007-127893 can be referred.

Example

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated concretely based on an Example. Materials, reagents, amounts of substances and their proportions, operations, and the like shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the present invention is not limited to the following examples.

<Production of IPS Mode Liquid Crystal Cell>

First, the IPS mode liquid crystal cell which has a liquid crystal layer between two glass substrates, and has a space | interval (gap) d of 4.0 micrometers is produced. Δn of the liquid crystalline compound in the liquid crystal layer was 0.08625, and the value of Δn · d was 345 nm. In addition, when forming a liquid crystal cell, the photo-alignment process was performed with reference to Example 11 of Unexamined-Japanese-Patent No. 2005-351924, the alignment layer was formed, and the liquid crystal compound in a liquid crystal cell was orientated. The tilt angle with the substrate surface of the liquid crystal compound was 0.1 degrees. On the board | substrate of the visual recognition side of a liquid crystal cell, the blue color filter, the green color filter, and the red color filter from which the value of Rth differs were formed, and the liquid crystal cells 1-12 shown in Table 1 were formed. In each liquid crystal cell, a wavelength representing the maximum transmittance of the blue color filter was λ ₁ , a wavelength representing the maximum transmittance of the green color filter was λ ₂ , and a wavelength representing the maximum transmittance of the red color filter was λ ₃ . Satisfied the relationship of λ ₁ <λ ₂ <λ ₃ . Moreover, Rth in each wavelength of each color filter arrange | positioned on the formed liquid crystal cell is put together in Table 1, and is shown.

In addition, adjustment of the value of Rth of each color filter adjusts the thickness of a color filter, or the retardation increasing agent (for example, the compound of the said general formula (X)) or a reducing agent (for example, to the formation material of a color filter layer) For example, it was performed by adding the compound of the said general formula (XI) or adjusting the addition amount.

In addition, in the liquid crystal cell 12, when the rubbing orientation process was performed instead of the photo-alignment process, the tilt angle with the board | substrate surface of the liquid crystal compound was 2.0 degrees.

TABLE 1

<Production of Optical Compensation Layer 1 (two-layer structure)>

Cycloolefin polymer film (1st optical) of unstretched cycloolefin polymer film (JSR Co., Ltd. brand name: Aton film) is uniaxially stretched, Re1 (550) = 110nm, Rth1 (550) = 55nm, and film thickness of 24 micrometers. Compensation layer).

Corona treatment was performed with a discharge amount of 125 W · min / m ² on one side of the polymer film, and the following composition A was applied to the surface on which the corona treatment was performed to form a coating film. Next, the coating film was heated for 90 seconds by the warm air of 70 degreeC for the drying of the solvent in a composition, and the orientation aging of a liquid crystalline compound. Under nitrogen purge, ultraviolet irradiation (300 mJ / cm ² ) was performed at 40 ° C. on the coating film under conditions of an oxygen concentration of 0.1% to fix the orientation of the liquid crystal compound to prepare an optical compensation layer 1. In addition, the optical compensation layer 1 was a two-layered constitution of the said cycloolefin polymer film (1st optical compensation layer) and the layer (2nd optical compensation layer) formed using the composition A. FIG.

(Preparation of Composition A)

The following components were mixed, the mixed liquid was prepared, the obtained liquid mixture was melt | dissolved in 25 degreeC for 1 hour, and was filtered with a 0.45 micrometer filter, and the composition A was prepared.

-------------------------------------------------- -----------

Composition A

-------------------------------------------------- -----------

Liquid Crystalline Compound R1 70.0 parts by mass

Liquid Crystalline Compound R2 20.0 parts by mass

Liquid Crystalline Compound R3 10.0 parts by mass

Orientation Aid A1 2.0 parts by mass

Compound B1 4.5 parts by mass

Monomer K1 4.0 parts by mass

Polymerization Initiator P1 5.0 parts by mass

Polymerization initiator P2 2.0 parts by mass

Surfactant S1 0.4 parts by mass

Surfactant S2 0.5 parts by mass

Acetone 386.4 parts by mass

Propylene Glycol Monomethyl Ether Acetate 71.0 parts by mass

Methanol 14.2 parts by mass

-------------------------------------------------- -----------

Liquid Crystalline Compound R1

A mixture of 83: 15: 2 (mass ratio) of the following liquid crystalline compounds (RA), (RB) and (RC)

[Formula 3]

Liquid Crystalline Compound R2

[Formula 4]

Liquid Crystalline Compound R3

[Formula 5]

Orientation Preparation A1

[Formula 6]

Compound B1

[Formula 7]

Monomer K1: A-TMMT (Shin-Nakamura Kagaku Kogyo Co., Ltd.)

Polymerization initiator P1

[Formula 8]

Polymerization initiator P2

[Formula 9]

Surfactant S1 (weight average molecular weight 15000, the numerical value in each repeating unit in a structural formula represents mass%)

[Formula 10]

Surfactant S2 (weight average molecular weight: 11,200)

The numerical value in each repeating unit in structural formula represents the mass%.

[Formula 11]

As a result of measuring the phase difference of the optical compensation layer 1 with AxoScan, Re (450) / Re (550) = 1.00 and Re (550) / Re (650) = 1.00.

Next, a second optical compensation layer was produced on the unstretched cycloolefin polymer film (trade name: Aton Film, manufactured by JSR Corporation, Re (550) = 0nm, Rth (550) = 1nm) by the same procedure, followed by AxoScan. As a result of estimating the phase difference of the produced said 2nd optical compensation layer, it was confirmed that Re2 (550) = 0nm, Rth2 (550) =-100nm, and the 2nd optical compensation layer is a positive C plate. Moreover, Rth2 (450) / Rth2 (550) = 1.04.

<Production of Optical Compensation Layer 2A ~ 2G (Two Layers)>

Except having used the composition B instead of the composition A, the optical compensation layer 2A was produced according to the procedure similar to <production of optical compensation layer 1 (two-layer structure)>. In addition, the optical compensation layer 2A was a two-layered constitution of the cycloolefin polymer film (first optical compensation layer) and the layer (second optical compensation layer) formed by using the composition B.

(Preparation of Composition B)

The following component was mixed, the mixed liquid was prepared, the obtained liquid mixture was melt | dissolved in 25 degreeC for 1 hour, and was filtered with a 0.45 micrometer filter, and the composition B was prepared.

-------------------------------------------------- -----------

Composition B

-------------------------------------------------- -----------

Liquid Crystalline Compound R1 50.0 parts by mass

Liquid Crystalline Compound R2 33.3 parts by mass

Liquid Crystalline Compound R3 16.7 parts by mass

Compound B1 1.5 parts by mass

Monomer K1 4.0 parts by mass

Polymerization Initiator P1 5.0 parts by mass

Polymerization initiator P2 2.0 parts by mass

Surfactant S1 0.4 parts by mass

Surfactant S2 0.5 parts by mass

Acetone 200.0 parts by mass

Propylene Glycol Monomethyl Ether Acetate 50.0 parts by mass

-------------------------------------------------- -----------

(Evaluation of Optical Compensation Layer 2A)

As a result of measuring the phase difference of the optical compensation layer 2A with AxoScan, it was confirmed that Re (450) / Re (550) = 1.00 and Re (550) / Re (650) = 1.00.

Next, as a result of estimating the phase difference of the second optical compensation layer by the method described above, it was confirmed that Re2 (550) = 0nm, Rth2 (550) =-100nm, and the second optical compensation layer was a positive C plate. Moreover, Rth2 (450) / Rth2 (550) = 0.90.

The thickness of a 1st optical compensation layer, the thickness of a 2nd optical compensation layer, and the composition ratio of the liquid crystalline compound in composition B were adjusted suitably, and optical compensation layers 2B-2G were manufactured according to the same procedure as the above-mentioned optical compensation layer 2A. did.

Re (450) / Re (550) and Re (550) / Re (650) of the optical compensation layers 2B-2G were all 1.00.

The phase difference of the 1st optical compensation layer in the optical compensation layer 2B was Re1 (550) = 120nm, Rth1 (550) = 60nm. The phase difference of the second optical compensation layer in the optical compensation layer 2B is Re2 (550) = 0nm, Rth2 (550) =-100nm, and Rth2 (450) / Rth2 (550) = 0.90, and the second optical compensation layer is positive C plate.

The retardation of the first optical compensation layer in the optical compensation layer 2C was Re1 (550) = 130 nm and Rth1 (550) = 65 nm. The phase difference of the second optical compensation layer in the optical compensation layer 2C is Re2 (550) = 0nm, Rth2 (550) =-100nm, and Rth2 (450) / Rth2 (550) = 0.90, and the second optical compensation layer is positive C plate.

The retardation of the first optical compensation layer in the optical compensation layer 2D was Re1 (550) = 120 nm and Rth1 (550) = 60 nm. The phase difference of the second optical compensation layer in the optical compensation layer 2D is Re2 (550) = 0nm, Rth2 (550) =-100nm, and Rth2 (450) / Rth2 (550) = 0.80, and the second optical compensation layer is positive C plate.

The phase difference of the 1st optical compensation layer in the optical compensation layer 2E was Re1 (550) = 110nm, Rth1 (550) = 55nm. The phase difference of the second optical compensation layer in the optical compensation layer 2E is Re2 (550) = 0nm, Rth2 (550) =-100nm, and Rth2 (450) / Rth2 (550) = 0.80, and the second optical compensation layer is positive C plate.

The retardation of the first optical compensation layer in the optical compensation layer 2F was Re1 (550) = 110 nm and Rth1 (550) = 55 nm. The phase difference of the second optical compensation layer in the optical compensation layer 2F is Re2 (550) = 0nm, Rth2 (550) =-90nm, and Rth2 (450) / Rth2 (550) = 0.80, and the second optical compensation layer is positive C plate.

The retardation of the first optical compensation layer in the optical compensation layer 2G was Re1 (550) = 100 nm and Rth1 (550) = 50 nm. The phase difference of the second optical compensation layer in the optical compensation layer 2G is Re2 (550) = 0nm, Rth2 (550) =-100nm, and Rth2 (450) / Rth2 (550) = 0.90, and the second optical compensation layer is positive C plate.

<Production of Optical Compensation Layer 3 (1 Layer Composition)>

The film thickness was adjusted with respect to the sample shown by Example 1 of Unexamined-Japanese-Patent No. 2006-072309, and the optical compensation layer 3 was produced.

As a result of measuring the phase difference of the optical compensation layer 3 by AxoScan, Re1 (550) = 230nm, Rth1 (550) = 0nm, Re (450) / Re (550) = 1.00, Re (550) / Re (650) = 1.00 It was.

<Production of Optical Compensation Layer 4 (two-layer structure)>

The cellulose acylate film (first optical compensation layer) was produced by adjusting the film thickness and the like with reference to the cellulose acylate film (h) of Example 4 of JP 2010-079288 A. As a result of measuring the phase difference of a 1st optical compensation layer by AxoScan, it was confirmed that Re1 (550) = 110nm, Rth1 (550) = 55nm and it became a positive A plate.

The single side | surface of this polymer film was corona-treated with discharge amount 125W * min / m <^2> , and the above-mentioned composition A was apply | coated to the surface which corona-treated, and the coating film was formed. Subsequently, the coating film was heated in 70 degreeC warm air for 90 second for drying of the solvent of a composition, and orientation aging of a liquid crystalline compound. Under nitrogen purge, UV irradiation (300 mJ / cm ² ) was performed at 40 ° C. on the coating film under conditions of an oxygen concentration of 0.1% to fix the orientation of the liquid crystal compound to prepare an optical compensation layer 4. In addition, the optical compensation layer 4 was a two-layered constitution of the said cellulose acylate film (1st optical compensation layer) and the layer (2nd optical compensation layer) formed using the composition A. FIG.

(Evaluation of Optical Compensation Layer 4)

When the phase difference of the optical compensation layer 4 was measured by AxoScan, it was confirmed that Re (450) / Re (550) = 1.20 and Re (550) / Re (650) = 1.05.

Next, as a result of evaluating the phase difference of the second optical compensation layer by the method described above, it was confirmed that Re2 (550) = 0nm, Rth2 (550) =-100nm, and became a positive C plate. Moreover, Rth2 (450) / Rth2 (550) = 1.04.

<Production of protective film 1>

Each following component was put into the mixing tank, it stirred, and the core layer cellulose acylate dope 1 was prepared.

-------------------------------------------------- -----------

Core layer cellulose acylate dope 1

-------------------------------------------------- -----------

Cellulose acetate of acetyl substitution degree 2.88 100 parts by mass

Ester oligomer A 10 parts by mass

Polarizer durability improver 4 parts by mass

UV absorbers 2 parts by mass

Methylene chloride (first solvent) 430 parts by mass

Methanol (second solvent) 64 parts by mass

-------------------------------------------------- -----------

Ester oligomer A (weight average molecular weight 750)

[Formula 12]

Polarizer durability improver

[Formula 13]

UV absorbers

[Formula 14]

10 mass parts of the following mat agent solutions were added to 90 mass parts of said core layer cellulose acylate dope 1, and outer layer cellulose acylate dope 1 was prepared.

-------------------------------------------------- -----------

Matte solution

-------------------------------------------------- -----------

Silica Particles with Average Particle Size 20nm

(AEROSIL R972, made by Nippon Aerosil Co., Ltd.)

2 parts by mass

Methylene chloride (first solvent) 76 parts by mass

Methanol (second solvent) 11 parts by mass

Core layer cellulose acylate dope 1 1 part by mass

-------------------------------------------------- -----------

The core layer cellulose acylate dope 1 and the outer layer cellulose acylate dope 1 on both sides were cast on a drum at 20 ° C. simultaneously from oil studies. In the state in which the solvent content rate of the film on a drum is about 20 mass%, the film is peeled from the drum top, the both ends of the width direction of the obtained film are fixed by a tenter clip, and in the state which the residual solvent in a film is 3 to 15%, The film was dried while stretching the film 1.1 times in the transverse direction. Then, the obtained film was conveyed between the rolls of a heat processing apparatus, and further it dried, the cellulose acylate film 1 of thickness 40micrometer was produced, and it was set as the protective film 1. As a result of measuring the phase difference of the protective film 1, it was Re (550) = 2nm and Rth (550) = 7nm.

<Production of protective film 2>

Each following component was put into the mixing tank, it stirred, and the core layer cellulose acylate dope 2 was prepared.

-------------------------------------------------- -------------

Core layer cellulose acylate dope 2

-------------------------------------------------- -------------

Cellulose acetate of acetyl substitution degree 2.88 100 parts by mass

Polyester 12 parts by mass

Polarizer durability improving agent 4 parts by mass

Methylene chloride (first solvent) 430 parts by mass

Methanol (second solvent) 64 parts by mass

-------------------------------------------------- -------------

Polyester (number average molecular weight 800)

[Formula 15]

10 mass parts of the following mat agent solutions were added to 90 mass parts of said core layer cellulose acylate dope 2, and outer layer cellulose acylate dope 2 was prepared.

-------------------------------------------------- ------------

Matte solution

-------------------------------------------------- ------------

Silica Particles with Average Particle Size 20nm

(AEROSIL R972, made by Nippon Aerosil Co., Ltd.)

2 parts by mass

Methylene chloride (first solvent) 76 parts by mass

Methanol (second solvent) 11 parts by mass

Core layer cellulose acylate dope 1 part by mass

-------------------------------------------------- ------------

After filtering the core layer cellulose acylate dope 2 and the outer layer cellulose acylate dope 2 with a filter paper having an average pore diameter of 34 μm and a sintered metal filter having an average pore diameter of 10 μm, respectively, the core layer cellulose acylate dope 2 and an outer layer on both sides thereof. Three layers of cellulose acylate dope 2 were cast on a drum at 20 ° C. from an oil study simultaneously (band softener).

Next, the film was peeled from the drum in a state where the solvent content of the film on the drum was approximately 20% by mass, the both ends in the width direction of the film were fixed with a tenter clip, and the film was dried while stretching at a draw ratio of 1.1 times in the transverse direction. . Then, the obtained film was conveyed between the rolls of a heat treatment apparatus, and further it dried, the cellulose acylate film 2 of thickness 40micrometer was produced, and it was set as the protective film 2. As a result of measuring the phase difference of the protective film 2, it was Re (550) = 1nm and Rth (550) =-5nm.

<Saponification of protective film>

The produced protective films 1 and 2 were immersed in 2.3 mol / L sodium hydroxide aqueous solution at 55 degreeC for 3 minutes. The immersed protective films 1 and 2 were taken out, washed in a water bath at room temperature, and neutralized with 0.05 mol / L sulfuric acid at 30 ° C. Again, the obtained protective films 1 and 2 were wash | cleaned in the water washing bath of room temperature, and also it dried by the warm air of 100 degreeC, and the saponification process of the surfaces of the protective films 1 and 2 was performed.

<Example 1>

(Production of polarizing plate)

The saponified protective film 1, the polyvinyl alcohol-based polarizer, and the optical compensation layer 1 are prepared by using an adhesive so that the absorption axis of the polarizer and the in-plane slow axis of the optical compensation layer are in parallel directions (0 °). It combined and produced the upper polarizing plate A. As an adhesive agent, 3 mass% aqueous solution of polyvinyl alcohol (PVA) (Gurere Co., Ltd., PVA-117H) was used. Moreover, the upper polarizing plate A was produced so that the 2nd optical compensation layer in the optical compensation layer 1 might be a polarizer side. That is, in the upper polarizing plate A, it is arrange | positioned in order of the protective film 1, a polarizer, a 2nd optical compensation layer, and a 1st optical compensation layer.

Moreover, the saponified protective film 1, the polyvinyl alcohol polarizer, and the saponified protective film 2 were bonded together in this order using the said adhesive agent, and the lower polarizing plate was produced.

Moreover, the upper polarizing plate B which shifted 0.5 degree with respect to the parallel direction (0 degree) of the absorption axis of a polarizer and the in-plane slow axis of an optical compensation layer was also produced at this time. That is, in the upper polarizing plate B, the angle between the absorption axis of the polarizer and the in-plane slow axis of the optical compensation layer is 0.5 °.

(Production of liquid crystal display device)

The said upper polarizing plate A and the lower polarizing plate were bonded to the produced liquid crystal cell 1 using SK2057 by Soken Chemical Co., Ltd. so that the optical compensation layer 1 and the protective film 2 might be the liquid crystal cell side, respectively, and the liquid crystal display device A was produced. . Under the present circumstances, it bonded together so that the slow axis of the liquid crystal layer in a liquid crystal cell and the absorption axis of the polarizer in the upper polarizing plate A might be orthogonal, and the slow axis of the liquid crystal layer in a liquid crystal cell and the absorption axis of the polarizer in a lower polarizing plate become parallel directions.

Moreover, the liquid crystal display device B was produced similarly using the upper polarizing plate B instead of the upper polarizing plate A. FIG.

<Examples 2-18, Comparative Examples 1-9>

A liquid crystal display device was manufactured according to the same procedure as in Example 1 except that the types of the optical compensation layer and the liquid crystal cell were changed as shown in Table 2.

In addition, when the optical compensation layer was a two-layer structure, the upper polarizing plate A was produced similarly to Example 1 so that the 2nd optical compensation layer in the optical compensation layer 1 may be a polarizer side.

<Evaluation>

(Measurement of hue of black display and measurement of light leakage)

The produced liquid crystal display devices A and B were placed on the diffused light source so that the lower polarizer plate was on the diffused light source side, and fixed at a polar angle of 60 ° using a measuring instrument "EZ-Contrast XL88" (manufactured by ELDIM), and the azimuth angle was 0 ° ( Change in color tone and light leakage in black display at 1 ° intervals to 359 ° counterclockwise from the horizontal direction).

The change of the black color tone at the time of using liquid crystal display devices A and B was evaluated by the following evaluation criteria.

A: Very little hue change, especially excellent

B: little change in color tone, excellent

C: Slight variation in hue, but no practical problem

D: Too much change in color, not acceptable

When evaluation using the liquid crystal display device B shifted the bonding angle of a polarizer and an optical compensation layer, it corresponds to the hue change evaluation (axis shift hue change) when visually recognized in the inclination direction at the time of black display.

Moreover, the light leakage in the polar angle of 60 degrees at the time of using the liquid crystal display device A was evaluated by the following evaluation criteria.

A: Very little light leakage, especially excellent

B: Less light leakage, excellent

C: Slight light leakage, but no practical problem

D: Many light leaks, unacceptable

In Table 2, "axis shift hue change" shows the evaluation result of the hue change when the liquid crystal display device B was used. "Tint change" shows the evaluation result of the color tone change when the liquid crystal display device A is used.

TABLE 2

As shown in Table 2, it was confirmed that a desired effect can be obtained as it is the liquid crystal display device of the present invention.

Especially, when the requirement of Formula (12) is satisfied from the comparison of Example 1 and 3, it was confirmed that the effect is more excellent.

Moreover, from the comparison of Example 2 and 5, when Rth2 (450) / Rth2 (550) is less than 0.90, it was confirmed that the effect is more excellent.

Moreover, when the requirements of Formula (1-1) were satisfied from the comparison between Example 4 and 11-13, it was confirmed that the effect was more excellent.

Moreover, in the aspect of the said Examples 1-18, even when the polarizer and the optical compensation layer are adhere | attached by the method as described below, favorable adhesiveness is obtained and the display performance similar to the case where it adhere | attached with the PVA 3% aqueous solution mentioned above. Was obtained.

(Preparation of Adhesive Liquid A)

The following compound was mixed at the ratio described and the adhesive liquid A was prepared.

Aronix M-220 (made by Toagosei Co., Ltd.): 20 parts by mass

4-hydroxybutyl acrylate (made by Nippon Kasei Co., Ltd.): 40 parts by mass

2-ethylhexyl acrylate (made by Mitsubishi Chemical Corporation): 40 parts by mass

Irgacure 907 (manufactured by BASF): 1.5 parts by mass

KAYACURE DETX-S (made by Nippon Kayaku Co., Ltd.): 0.5 parts by mass

After corona treatment of the polarizer bonding surface of the optical compensation layer with a discharge amount of 125 W · min / m ² , the adhesive liquid A was coated so as to have a thickness of 0.5 μm. Thereafter, the adhesive coated surface was bonded to the polarizer, and 300 mJ / cm ² ultraviolet light was irradiated from the optical compensation layer side at 40 ° C. in the air atmosphere. Then, it dried at 60 degreeC for 3 minutes. In addition, when a 2nd optical compensation layer was a liquid crystal layer, the 2nd optical compensation layer was hardened in air | atmosphere rather than under nitrogen purge, and it adhere | attached with the polarizer by the said method after that.

1 upper protective film
2 polarizer
Absorption axis of 3 polarizers
4 second optical compensation layer
5 First optical compensation layer
6 In-plane slow axis of the first optical compensation layer
7 liquid crystal cell upper substrate
8 liquid crystal compound (liquid crystal layer)
9 liquid crystal cell lower substrate
10 protective film
11 polarizer
12 Absorption axis of polarizer
13 protective film
14 Backlight Unit
15 Optical Compensation Layer
16 upper polarizer
17 Lower Polarizer

Claims (14)

At least one has a pair of opposingly arranged board | substrates which have an electrode, and the liquid crystal layer which is arrange | positioned between the said pair of board | substrates, and contains an orientation controlled liquid crystal compound, Comprising: With respect to the board | substrate which has the said electrode by the said electrode A liquid crystal cell in which an electric field having a parallel component is formed, and
A liquid crystal display device comprising at least a pair of polarizing plates arranged to sandwich the liquid crystal cell,
The tilt angle of the liquid crystal compound is 1.0 ° or less,
The liquid crystal cell comprises at least a first pixel region, a second pixel region, and a third pixel region,
A first color filter disposed on the first pixel region of the liquid crystal cell, a second color filter disposed on the second pixel region of the liquid crystal cell, between the pair of polarizing plates, and the liquid crystal cell A third color filter disposed on the third pixel region of is included on the visual side than the liquid crystal cell,
When λ ₁ is the wavelength representing the maximum transmittance of the first color filter, λ ₂ is the wavelength representing the maximum transmittance of the second color filter, and λ ₃ is the wavelength representing the maximum transmittance of the third color filter. Satisfy the relationship of ₁ <λ ₂ <λ ₃ ,
Retardation Rth (λ ₁ ) in the thickness direction in wavelength λ ₁ of the first color filter, retardation Rth (λ ₂ ) in the thickness direction in wavelength λ ₂ of the second color filter, and the third The retardation Rth (λ ₃ ) in the thickness direction in the wavelength λ ₃ of the color filter satisfies the requirements of the formulas (1) to (3),
(1) (Rth (λ ₁ ) -5nm) ≤Rth (λ ₂ ) ≤Rth (λ ₃ )
Equation (2) -5nm≤Rth (λ ₂ ) ≤25nm
Equation (3) -10nm≤Rth (λ ₁ ) ≤25nm
The polarizing plate arrange | positioned at the visual recognition side among the pair of polarizing plates contains an optical compensation layer and a polarizer from the said liquid crystal cell side,
The in-plane slow axis of the optical compensation layer and the absorption axis of the polarizer are parallel,
In-plane retardation Re (450) in wavelength 450nm of the said optical compensation layer, in-plane retardation Re (550) in wavelength 550nm, and in-plane retardation Re (650) in wavelength 650nm are represented by Formula (5). ) And (6), the liquid crystal display device.
Equation (4) 0.95≤Re (450) / Re (550) ≤1.10
Equation (5) 0.95≤Re (550) / Re (650) ≤1.10 The method according to claim 1,
The liquid crystal display device which satisfy | fills the requirements of Formula (1-1).
Equation _{(1-1) Rth (λ 1)} ≤Rth (λ 2) ≤Rth (λ 3) The method according to claim 1 or 2,
The optical compensation layer is one layer,
In-plane retardation Re1 (550) in wavelength 550nm of the said optical compensation layer, and retardation Rth1 (550) of thickness direction in wavelength 550nm satisfy | fill the requirements of Formula (6) and (7), Liquid crystal display.
Equation (6) 200nm≤Re1 (550) ≤320nm
Equation (7) -40nm≤Rth1 (550) ≤40nm The method according to claim 1 or 2,
The optical compensation layer includes a first optical compensation layer and a second optical compensation layer in order from the liquid crystal cell side,
In-plane retardation Re1 (550) in wavelength 550nm of the said 1st optical compensation layer, and retardation Rth1 (550) of thickness direction in wavelength 550nm satisfy | fill the requirements of Formula (8) and (9). And
Equation (8) 80nm≤Re1 (550) ≤200nm
(9) 20nm≤Rth1 (550) ≤150nm
In-plane retardation Re2 (550) in wavelength 550nm of the said 2nd optical compensation layer, and retardation Rth2 (550) of thickness direction in wavelength 550nm satisfy | fill the requirements of Formula (10) and (11). Liquid crystal display device.
Equation (10) 0nm≤Re2 (550) ≤40nm
Equation (11) -160 nm ≤ Rth 2 (550) ≤-40 nm The method according to claim 4,
Wherein the first optical compensation layer is a positive A plate, and the second optical compensation layer is a positive C plate. The method according to claim 5,
The first optical compensation layer is a λ / 4 layer. The method according to any one of claims 4 to 6,
The retardation Rth2 (450) of the thickness direction in wavelength 450nm of the said 2nd optical compensation layer, and the retardation Rth2 (550) of the thickness direction in wavelength 550nm satisfy | fill the requirements of Formula (12), Liquid crystal display.
Equation (12) Rth2 (450) / Rth2 (550) ≤1.00 The method according to any one of claims 4 to 7,
The said 2nd optical compensation layer is a film which was immobilized in the state which the liquid crystalline compound orientated, The liquid crystal display device. The method according to claim 8,
The second optical compensation layer is a liquid crystal display device wherein the rod-like liquid crystal compound is a film fixed in a state in which the rod-like liquid crystal compound is oriented in the vertical direction with respect to the substrate surface. The method according to any one of claims 4 to 9,
The said 1st optical compensation layer is a cycloolefin type polymer film, The liquid crystal display device. The method according to any one of claims 1 to 10,
The polarizing plate on the side that is visible than the liquid crystal cell includes a polarizer,
A liquid crystal display device having an isotropic refractive index between the polarizer and the liquid crystal layer. The method according to any one of claims 1 to 11,
And the optical compensation layer is in contact with the polarizer via a polyvinyl alcohol adhesive. The method according to any one of claims 1 to 11,
The optical compensation layer is in contact with the polarizer through the curable adhesive composition cured by irradiation or heating of active energy rays. The method according to any one of claims 1 to 13,
The liquid crystal display device which satisfy | fills the requirements of Formula (1-2).
Equation (1-2) Rth (λ ₁ ) <Rth (λ ₂ ) <Rth (λ ₃ )

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